Legal analysis: Whether forging another person’s signature constitutes a crime needs to be determined based on the impact of the forgery. If a signature is forged and used to forge IOUs or contracts, causing property damage to others, it constitutes a crime.

Legal basis: "Criminal Law of the People's Republic of China" Article 266 Whoever defrauds public or private property, if the amount is relatively large, shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or surveillance, and shall also be sentenced to or A fine shall be imposed alone; if the amount is huge or there are other serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years, and shall also be fined; if the amount is particularly huge or there are other particularly serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than ten years or life imprisonment and shall also be fined. money or confiscation of property. If this law provides otherwise, the provisions shall prevail.